Typically used to provide structural stability in curved elements such as arches or for aesthetic detailing e.g. circular windows.
* It is possible to use standard arch bricks for spans other than the ideal, ranging from 800mm to 3000mm in half-brick increments, by varying the number of bricks, providing the slight tapering of the joints is aesthetically acceptable. The taper may vary between 0.9mm and 1.6mm for hte smallest span to less than 1mm for the larger spans.
† Parallel joints of acceptable width ar achieved using either of the alternative number of bricks in the semi-circle if the bricks confirm to the work sizes.
The actual size of bricks normally varies slightly from the work size. If the bricks on site are larger, then the smaller number of bricks in the semi-circle would be more appropriate and vice-versa.
* This format is not as versatile in application as the AR series because the longer voussoir joint accentuates splays. Tolerance allowances limit versatility further.
†Parallel joints of acceptable width are achieved using either of the alternative number of bricks in the semi-circle if the bricks confirm to the work sizes.